US20130323046A1 - Seal land for static structure of a gas turbine engine - Google Patents
Seal land for static structure of a gas turbine engine Download PDFInfo
- Publication number
- US20130323046A1 US20130323046A1 US13/487,742 US201213487742A US2013323046A1 US 20130323046 A1 US20130323046 A1 US 20130323046A1 US 201213487742 A US201213487742 A US 201213487742A US 2013323046 A1 US2013323046 A1 US 2013323046A1
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- United States
- Prior art keywords
- static structure
- seal land
- recited
- radially
- gas turbine
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- 230000003068 static effect Effects 0.000 title claims description 83
- 239000012530 fluid Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 23
- 238000007789 sealing Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/005—Sealing means between non relatively rotating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/162—Bearing supports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
Definitions
- This disclosure relates to a gas turbine engine, and more particularly to a static structure that can be incorporated into a gas turbine engine.
- Gas turbine engines typically include a compressor section, a combustor section and a turbine section. During operation, air is pressurized in the compressor section and is mixed with fuel and burned in the combustor section to generate hot combustion gases. The hot combustion gases are communicated through the turbine section, which extracts energy from the hot combustion gases to power the compressor section and other gas turbine engine loads.
- Gas turbine engines may be assembled from numerous coaxial housings and components that must be sealed relative to one another to address pressure differentials and thermal loading that can exist between these components during gas turbine engine operation.
- static structures such as mid-turbine frames, ducts, vane assemblies, nozzle assemblies and the like, may need to be sealed relative to cavities that extend between the static structures and inner and outer casings of an engine static structure.
- a seal land for a gas turbine engine can include a seal body that can extend between a leading edge portion, a trailing edge portion, a radially outer surface and a radially inner surface.
- a notch can extend at least partially through the seal body between the radially outer surface and the radially inner surface.
- one of the radially outer surface and the radially inner surface can include a conical surface and the other of the radially outer surface and the radially inner surface includes a cylindrical surface.
- the notch can be V-shaped.
- the notch can be formed at the trailing edge portion of the seal body.
- a static structure for a gas turbine engine can include at least one airfoil that extends between an inner platform and an outer platform.
- At least one seal land can extend from one of the inner platform and the outer platform, and the at least one seal land can include a radially outer surface, a radially inner surface and a notch circumferentially disposed between the radially outer surface and the radially inner surface.
- the static structure can include a mid-turbine frame.
- the at least one seal land can include at least one relief slot.
- a seal ring can be positioned between the at least one seal land and a casing of an engine static structure.
- one of the radially outer surface and the radially inner surface can include a conical surface.
- one of the radially inner surface and the radially outer surface can include a cylindrical surface.
- the notch can extend aft of a trailing edge of said at least one airfoil.
- the notch can be V-shaped.
- the at least one seal land can be positioned at an aft, inner diameter portion of the static structure.
- the notch can circumferentially extend about a trailing edge portion of the at least one seal land.
- a gas turbine engine can include a compressor section, a combustor section in fluid communication with the compressor section, a turbine section in fluid communication with the combustor section, and a static structure positioned relative to at least one of the compressor section, the combustor section and the turbine section.
- the static structure can include a multitude of airfoils and at least one seal land that extends from a portion of each of the multitude of airfoils.
- the at least one seal land can include a notch circumferentially disposed aft of a trailing edge of each of the multitude of airfoils.
- each of the multitude of airfoils can extend between an inner platform and an outer platform, and the at least one seal land can extend from at least one of the inner platform and the outer platform.
- the at least one seal land can include a radially outer surface and a radially inner surface.
- One of the radially outer surface and the radially inner surface can be mounted to one of the inner platform and the outer platform.
- the radially outer surface of the at least one seal land can include a conical surface.
- the radially inner surface of the at least one seal land can include a cylindrical surface.
- the notch can be V-shaped.
- FIG. 1 illustrates a schematic, cross-sectional view of a gas turbine engine.
- FIG. 2 illustrates a cross-section of a static structure that can be incorporated into a gas turbine engine.
- FIG. 3 illustrates a perspective view of a static structure.
- FIG. 4 illustrates a cross-sectional view of a portion of a static structure.
- FIG. 5 illustrates an enlarged, cross-sectional view of a portion of a static structure.
- FIGS. 6A and 6B illustrate portions of additional static structures.
- FIG. 1 schematically illustrates a gas turbine engine 20 .
- the exemplary gas turbine engine 20 is a two-spool turbofan engine that generally incorporates a fan section 22 , a compressor section 24 , a combustor section 26 and a turbine section 28 .
- Alternative engines might include an augmenter section (not shown) among other systems for features.
- the fan section 22 drives air along a bypass flow path B, while the compressor section 24 drives air along a core flow path C for compression and communication into the combustor section 26 .
- the hot combustion gases generated in the combustor section 24 are expanded through the turbine section 28 .
- FIG. 1 schematically illustrates a gas turbine engine 20 .
- the exemplary gas turbine engine 20 is a two-spool turbofan engine that generally incorporates a fan section 22 , a compressor section 24 , a combustor section 26 and a turbine section 28 .
- Alternative engines might include an augmenter section (not shown) among other systems for features.
- the fan section 22 drives air
- the gas turbine engine 20 generally includes a low speed spool 30 and a high speed spool 32 mounted for rotation about an engine centerline longitudinal axis A relative to an engine static structure 33 via several bearing systems 31 . It should be understood that various bearing systems 31 at various locations may alternatively or additionally be provided.
- the low speed spool 30 generally includes an inner shaft 34 that interconnects a fan 36 , a low pressure compressor 38 and a low pressure turbine 39 .
- the high speed spool 32 includes an outer shaft 35 that interconnects a high pressure compressor 37 and a high pressure turbine 40 .
- the inner shaft 34 and the outer shaft 35 are supported at various axial locations by bearing systems 31 positioned within the engine static structure 33 .
- a combustor 42 is arranged between the high pressure compressor 37 and the high pressure turbine 40 .
- a static structure 44 of the engine static structure 33 also referred to as a mid-turbine frame, can be arranged generally between the high pressure turbine 40 and the low pressure turbine 39 .
- the static structure 44 can support one or more bearing systems 31 of the turbine section 28 .
- the static structure 44 can include one or more airfoils 46 that can be positioned within the core flow path C.
- the inner shaft 34 and the outer shaft 35 are concentric and rotate via the bearing systems 31 about the engine centerline longitudinal axis A, which is co-linear with their longitudinal axes.
- the core airflow is compressed by the low pressure compressor 38 and the high pressure compressor 37 , is mixed with fuel and burned in the combustor 42 , and is then expanded over the high pressure turbine 40 and the low pressure turbine 39 .
- the high pressure turbine 40 and the low pressure turbine 39 rotationally drive the respective low speed spool 30 and the high speed spool 32 in response to the expansion.
- FIG. 2 illustrates a static structure 44 that can be incorporated into a gas turbine engine, such as the gas turbine engine 20 .
- the static structure 44 is a mid-turbine frame that can be positioned between the high pressure turbine 40 and the low pressure turbine 39 (See FIG. 1 ).
- the teachings of this disclosure are not limited to the mid-turbine frame and could extend to other static structures, including but not limited to, ducts, vane assemblies, nozzle assemblies and any other full hoop ring assemblies.
- the static structure 44 can be mounted to extend between an outer casing 50 and an inner casing 52 of the engine static structure 33 .
- the outer casing 50 and the inner casing 52 can be part of a turbine exhaust case of the engine static structure 33 .
- the inner casing 52 can support a bearing system 31 as well as other components within which the inner and outer shafts 34 , 35 rotate.
- the static structure 44 can be mechanically attached relative to the outer casing 50 and inner casing 52 or can be thermally free relative to these structures. It should be understood that various attachment arrangements may alternatively or additionally be utilized.
- the exemplary static structure 44 can include a multitude of airfoils 46 that radially extend between an inner platform 62 and an outer platform 64 of the static structure 44 .
- the multitude of airfoils 46 are axially disposed between a leading edge 66 and a trailing edge 68 of the static structure 44 .
- the multitude of airfoils 46 can be assembled to form an annular ring assembly that circumferentially extends about the engine centerline longitudinal axis A to define a portion of the annular core flow path C radially between the inner platform 62 and the outer platform 64 and across the multitude of airfoils 46 .
- the inner platform 62 and the outer platform 64 establish the inner and outer boundaries of the core flow path C within the static structure 44 .
- the static structure 44 can include one or more sealing mechanisms, such as a seal land, that can be incorporated onto the static structure 44 to seal the static structure 44 relative to the inner casing 52 and the outer casing 50 (See FIG. 2 ), or other surrounding structures.
- the static structure 44 includes a seal land 70 that can be mounted to, integrally cast, integrally machined or integrally forged with the static structure 44 to enable sealing at one or more portions of the static structure 44 , as is further discussed below.
- FIG. 4 illustrates a cross-sectional view of a portion of the static structure 44 .
- the static structure 44 may require sealing at an upstream, outer diameter portion 74 , an upstream, inner diameter portion 76 , an aft, outer diameter portion 78 and/or an aft, inner diameter portion 72 .
- seal land 70 are described herein with respect to the aft, inner diameter portion 72 of the static structure 44 , it should be understood that seal lands 70 could be arranged to seal one or more portions of the static structure 44 , including but not limited to, the upstream, outer diameter portion 74 , the upstream, inner diameter portion 76 , and/or the aft, outer diameter portion 78 .
- the seal land 70 can be circumferentially disposed about the engine centerline axis A adjacent the trailing edge 68 of the static structure 44 and at the inner platform 62 of the multitude of airfoils 46 (only one shown in FIG. 4 ). In other words, in this example, the seal land 70 extends from the static structure 44 at its aft, inner diameter portion 72 .
- the static structure 44 may be manufactured of a cast nickel alloy. However, it should be understood that various other materials may be utilized and may be specifically selected to match a coefficient of thermal expansion between the different parts of the static structure 44 .
- the seal land 70 can radially extend between the inner platform 62 and the inner casing 52 of the engine static structure 33 .
- the inner casing 52 may include a portion of a turbine exhaust case where the static structure 44 is a mid-turbine frame.
- other sections of the gas turbine engine 20 could also benefit from this disclosure.
- the inner casing 52 can include a recess 80 that can receive a seal ring 82 that extends radially between the seal land 70 and the inner casing 52 to seal the aft, inner diameter portion 72 of the static structure 44 .
- the seal ring 82 could include a piston seal or any other suitable seal.
- FIG. 5 illustrates an enlarged view of the aft, inner diameter portion 72 of the static structure 44 .
- the seal land 70 can extend in a radial direction R between the inner platform 62 and the inner casing 52 .
- the exemplary seal land 70 includes a seal body 85 having a leading edge portion 84 , a trailing edge portion 86 , a radially outer surface 88 and a radially inner surface 90 .
- the radially outer surface 88 includes a conical surface that axially extends transversely relative to the engine centerline longitudinal axis A.
- the radially outer surface 88 can provide a braze surface for mounting the seal land 70 to an inner surface 92 of the inner platform 62 .
- other attachment arrangements may alternatively or additionally be utilized, and the seal land 70 could also be cast integrally with the inner platform 62 .
- the radially inner surface 90 can include a cylindrical surface.
- the radially inner surface 90 provides a cylindrical sealing surface for sealing relative to the seal ring 82 .
- the cylindrical sealing surface could alternatively be the radially outer surface of the seal land 70 where the seal land 70 is positioned relative to either the upstream, outer diameter portion 74 or the aft, outer diameter portion 78 of the static structure.
- the seal body 85 can also include at least one notch 94 that is circumferentially disposed between the radially outer surface 88 and the radially inner surface 90 of the seal land 70 .
- the notch 94 extends from the trailing edge portion 86 in a direction toward the leading edge portion 84 .
- the notch 94 can extend through a portion of the seal body 85 in an upstream direction U relative to the static structure 44 .
- the notch 94 can be V-shaped. However, other shapes and configurations are contemplated as within the scope of this disclosure. In this exemplary embodiment, the notch 94 is positioned such that it extends aft from a trailing edge 96 of the airfoil 46 . In addition, a point 98 of the notch 94 can be positioned aft of the seal ring 82 . The actual position, depth and dimensions of the notch 94 may vary and are dependent on design and environmental specific parameters.
- the notch 94 is formed at the trailing edge 86 of the seal body 85 such that a first thickness T 1 extends radially outward of the notch 94 and a second thickness T 2 extends radially inwardly from the notch 94 .
- the first thickness T 1 can be different from the second thickness T 2 .
- the notch 94 removes weight from the seal land 70 and can alleviate thermal mismatch that may occur between the seal land 70 and the hot combustion gases that are communicated along the core flow path C through the static structure 44 .
- FIGS. 6A and 6B illustrate portions of another example static structure 144 .
- the static structure 144 can include a seal land 170 that is similar to the seal land 70 detailed above.
- the seal land 170 can include additional features.
- the seal land 170 can include one or more relief slots 100 (i.e., cut-out portions of the seal land 170 ).
- the seal land 170 of the static structure 144 could include a multitude of relief slots 100 circumferentially disposed in a spaced relationship about the seal land 170 .
- the relief slots 100 extend from a trailing edge 186 of the seal land 170 in the same direction as the notch 94 .
- the relief slots 100 can be generally crescent shaped.
- the relief slots 100 can also extend to the same depth as the notch 94 .
- the relief slots 100 are formed on a radially inner surface 190 of the seal land 170 .
- At least one relief slot 100 is associated with each of the airfoils 46 of the static structure 144 .
- the seal land 170 could include (14) relief slots 100 .
- the relief slots 100 may reduce the strain experienced at portions of the airfoils 46 , such as the leading or trailing edge portions.
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Turbine Rotor Nozzle Sealing (AREA)
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Abstract
Description
- This disclosure relates to a gas turbine engine, and more particularly to a static structure that can be incorporated into a gas turbine engine.
- Gas turbine engines typically include a compressor section, a combustor section and a turbine section. During operation, air is pressurized in the compressor section and is mixed with fuel and burned in the combustor section to generate hot combustion gases. The hot combustion gases are communicated through the turbine section, which extracts energy from the hot combustion gases to power the compressor section and other gas turbine engine loads.
- Gas turbine engines may be assembled from numerous coaxial housings and components that must be sealed relative to one another to address pressure differentials and thermal loading that can exist between these components during gas turbine engine operation. For example, static structures, such as mid-turbine frames, ducts, vane assemblies, nozzle assemblies and the like, may need to be sealed relative to cavities that extend between the static structures and inner and outer casings of an engine static structure.
- A seal land for a gas turbine engine according to an exemplary embodiment of the present disclosure can include a seal body that can extend between a leading edge portion, a trailing edge portion, a radially outer surface and a radially inner surface. A notch can extend at least partially through the seal body between the radially outer surface and the radially inner surface.
- In a further embodiment of the foregoing seal land embodiment, one of the radially outer surface and the radially inner surface can include a conical surface and the other of the radially outer surface and the radially inner surface includes a cylindrical surface.
- In a further embodiment of either of the foregoing seal land embodiments, the notch can be V-shaped.
- In a further embodiment of any of the foregoing seal land embodiments, the notch can be formed at the trailing edge portion of the seal body.
- A static structure for a gas turbine engine according to another exemplary embodiment of the present disclosure can include at least one airfoil that extends between an inner platform and an outer platform. At least one seal land can extend from one of the inner platform and the outer platform, and the at least one seal land can include a radially outer surface, a radially inner surface and a notch circumferentially disposed between the radially outer surface and the radially inner surface.
- In a further embodiment of the foregoing static structure embodiment, the static structure can include a mid-turbine frame.
- In a further embodiment of either of the foregoing static structure embodiments, the at least one seal land can include at least one relief slot.
- In a further embodiment of any of the foregoing static structure embodiments, a seal ring can be positioned between the at least one seal land and a casing of an engine static structure.
- In a further embodiment of any of the foregoing static structure embodiments, one of the radially outer surface and the radially inner surface can include a conical surface.
- In a further embodiment of any of the foregoing static structure embodiments, one of the radially inner surface and the radially outer surface can include a cylindrical surface.
- In a further embodiment of any of the foregoing static structure embodiments, the notch can extend aft of a trailing edge of said at least one airfoil.
- In a further embodiment of any of the foregoing static structure embodiments, the notch can be V-shaped.
- In a further embodiment of any of the foregoing static structure embodiments, the at least one seal land can be positioned at an aft, inner diameter portion of the static structure.
- In a further embodiment of any of the foregoing static structure embodiments, the notch can circumferentially extend about a trailing edge portion of the at least one seal land.
- A gas turbine engine according to yet another exemplary embodiment of the present disclosure can include a compressor section, a combustor section in fluid communication with the compressor section, a turbine section in fluid communication with the combustor section, and a static structure positioned relative to at least one of the compressor section, the combustor section and the turbine section. The static structure can include a multitude of airfoils and at least one seal land that extends from a portion of each of the multitude of airfoils. The at least one seal land can include a notch circumferentially disposed aft of a trailing edge of each of the multitude of airfoils.
- In a further embodiment of the foregoing gas turbine engine embodiment, each of the multitude of airfoils can extend between an inner platform and an outer platform, and the at least one seal land can extend from at least one of the inner platform and the outer platform.
- In a further embodiment of either of the foregoing gas turbine engine embodiments, the at least one seal land can include a radially outer surface and a radially inner surface. One of the radially outer surface and the radially inner surface can be mounted to one of the inner platform and the outer platform.
- In a further embodiment of any of the foregoing gas turbine engine embodiments, the radially outer surface of the at least one seal land can include a conical surface.
- In a further embodiment of any of the foregoing gas turbine engine embodiments, the radially inner surface of the at least one seal land can include a cylindrical surface.
- In a further embodiment of any of the foregoing gas turbine engine embodiments, the notch can be V-shaped.
- The various features and advantages of this disclosure will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
-
FIG. 1 illustrates a schematic, cross-sectional view of a gas turbine engine. -
FIG. 2 illustrates a cross-section of a static structure that can be incorporated into a gas turbine engine. -
FIG. 3 illustrates a perspective view of a static structure. -
FIG. 4 illustrates a cross-sectional view of a portion of a static structure. -
FIG. 5 illustrates an enlarged, cross-sectional view of a portion of a static structure. -
FIGS. 6A and 6B illustrate portions of additional static structures. -
FIG. 1 schematically illustrates agas turbine engine 20. The exemplarygas turbine engine 20 is a two-spool turbofan engine that generally incorporates afan section 22, acompressor section 24, acombustor section 26 and aturbine section 28. Alternative engines might include an augmenter section (not shown) among other systems for features. Thefan section 22 drives air along a bypass flow path B, while thecompressor section 24 drives air along a core flow path C for compression and communication into thecombustor section 26. The hot combustion gases generated in thecombustor section 24 are expanded through theturbine section 28. Although depicted as a turbofan gas turbine engine in the disclosed non-limiting embodiment, it should be understood that the concepts described herein are not limited to turbofan engines and these teachings could extend to other types of engines, including but not limited to, three-spool engine architectures. - The
gas turbine engine 20 generally includes alow speed spool 30 and ahigh speed spool 32 mounted for rotation about an engine centerline longitudinal axis A relative to an enginestatic structure 33 viaseveral bearing systems 31. It should be understood thatvarious bearing systems 31 at various locations may alternatively or additionally be provided. - The
low speed spool 30 generally includes aninner shaft 34 that interconnects afan 36, alow pressure compressor 38 and alow pressure turbine 39. Thehigh speed spool 32 includes anouter shaft 35 that interconnects ahigh pressure compressor 37 and ahigh pressure turbine 40. In this example, theinner shaft 34 and theouter shaft 35 are supported at various axial locations bybearing systems 31 positioned within the enginestatic structure 33. - A
combustor 42 is arranged between thehigh pressure compressor 37 and thehigh pressure turbine 40. Astatic structure 44 of the enginestatic structure 33, also referred to as a mid-turbine frame, can be arranged generally between thehigh pressure turbine 40 and thelow pressure turbine 39. Thestatic structure 44 can support one or more bearingsystems 31 of theturbine section 28. Thestatic structure 44 can include one ormore airfoils 46 that can be positioned within the core flow path C. - The
inner shaft 34 and theouter shaft 35 are concentric and rotate via thebearing systems 31 about the engine centerline longitudinal axis A, which is co-linear with their longitudinal axes. The core airflow is compressed by thelow pressure compressor 38 and thehigh pressure compressor 37, is mixed with fuel and burned in thecombustor 42, and is then expanded over thehigh pressure turbine 40 and thelow pressure turbine 39. Thehigh pressure turbine 40 and thelow pressure turbine 39 rotationally drive the respectivelow speed spool 30 and thehigh speed spool 32 in response to the expansion. -
FIG. 2 illustrates astatic structure 44 that can be incorporated into a gas turbine engine, such as thegas turbine engine 20. In this example, thestatic structure 44 is a mid-turbine frame that can be positioned between thehigh pressure turbine 40 and the low pressure turbine 39 (SeeFIG. 1 ). However, the teachings of this disclosure are not limited to the mid-turbine frame and could extend to other static structures, including but not limited to, ducts, vane assemblies, nozzle assemblies and any other full hoop ring assemblies. - The
static structure 44 can be mounted to extend between anouter casing 50 and aninner casing 52 of the enginestatic structure 33. For example, theouter casing 50 and theinner casing 52 can be part of a turbine exhaust case of the enginestatic structure 33. Theinner casing 52 can support abearing system 31 as well as other components within which the inner andouter shafts - The
static structure 44 can be mechanically attached relative to theouter casing 50 andinner casing 52 or can be thermally free relative to these structures. It should be understood that various attachment arrangements may alternatively or additionally be utilized. - Referring to
FIG. 3 , the exemplarystatic structure 44 can include a multitude ofairfoils 46 that radially extend between aninner platform 62 and anouter platform 64 of thestatic structure 44. The multitude ofairfoils 46 are axially disposed between aleading edge 66 and a trailingedge 68 of thestatic structure 44. - The multitude of
airfoils 46 can be assembled to form an annular ring assembly that circumferentially extends about the engine centerline longitudinal axis A to define a portion of the annular core flow path C radially between theinner platform 62 and theouter platform 64 and across the multitude ofairfoils 46. In other words, theinner platform 62 and theouter platform 64 establish the inner and outer boundaries of the core flow path C within thestatic structure 44. - The
static structure 44 can include one or more sealing mechanisms, such as a seal land, that can be incorporated onto thestatic structure 44 to seal thestatic structure 44 relative to theinner casing 52 and the outer casing 50 (SeeFIG. 2 ), or other surrounding structures. In one non-limiting embodiment, thestatic structure 44 includes aseal land 70 that can be mounted to, integrally cast, integrally machined or integrally forged with thestatic structure 44 to enable sealing at one or more portions of thestatic structure 44, as is further discussed below. -
FIG. 4 illustrates a cross-sectional view of a portion of thestatic structure 44. In this exemplary embodiment, thestatic structure 44 may require sealing at an upstream,outer diameter portion 74, an upstream,inner diameter portion 76, an aft,outer diameter portion 78 and/or an aft,inner diameter portion 72. Although the various features of theseal land 70 are described herein with respect to the aft,inner diameter portion 72 of thestatic structure 44, it should be understood that seal lands 70 could be arranged to seal one or more portions of thestatic structure 44, including but not limited to, the upstream,outer diameter portion 74, the upstream,inner diameter portion 76, and/or the aft,outer diameter portion 78. Theseal land 70 can be circumferentially disposed about the engine centerline axis A adjacent the trailingedge 68 of thestatic structure 44 and at theinner platform 62 of the multitude of airfoils 46 (only one shown inFIG. 4 ). In other words, in this example, theseal land 70 extends from thestatic structure 44 at its aft,inner diameter portion 72. - In one exemplary embodiment, the
static structure 44, including theseal land 70, may be manufactured of a cast nickel alloy. However, it should be understood that various other materials may be utilized and may be specifically selected to match a coefficient of thermal expansion between the different parts of thestatic structure 44. - The
seal land 70 can radially extend between theinner platform 62 and theinner casing 52 of the enginestatic structure 33. For example, theinner casing 52 may include a portion of a turbine exhaust case where thestatic structure 44 is a mid-turbine frame. However, other sections of thegas turbine engine 20 could also benefit from this disclosure. - The
inner casing 52 can include arecess 80 that can receive aseal ring 82 that extends radially between theseal land 70 and theinner casing 52 to seal the aft,inner diameter portion 72 of thestatic structure 44. Theseal ring 82 could include a piston seal or any other suitable seal. -
FIG. 5 illustrates an enlarged view of the aft,inner diameter portion 72 of thestatic structure 44. As stated above, theseal land 70 can extend in a radial direction R between theinner platform 62 and theinner casing 52. Theexemplary seal land 70 includes aseal body 85 having aleading edge portion 84, a trailingedge portion 86, a radiallyouter surface 88 and a radiallyinner surface 90. In one exemplary embodiment, the radiallyouter surface 88 includes a conical surface that axially extends transversely relative to the engine centerline longitudinal axis A. The radiallyouter surface 88 can provide a braze surface for mounting theseal land 70 to an inner surface 92 of theinner platform 62. However, it should be understood that other attachment arrangements may alternatively or additionally be utilized, and theseal land 70 could also be cast integrally with theinner platform 62. - The radially
inner surface 90 can include a cylindrical surface. The radiallyinner surface 90 provides a cylindrical sealing surface for sealing relative to theseal ring 82. It should be understood that the cylindrical sealing surface could alternatively be the radially outer surface of theseal land 70 where theseal land 70 is positioned relative to either the upstream,outer diameter portion 74 or the aft,outer diameter portion 78 of the static structure. - The
seal body 85 can also include at least onenotch 94 that is circumferentially disposed between the radiallyouter surface 88 and the radiallyinner surface 90 of theseal land 70. In this exemplary embodiment, thenotch 94 extends from the trailingedge portion 86 in a direction toward theleading edge portion 84. In other words, thenotch 94 can extend through a portion of theseal body 85 in an upstream direction U relative to thestatic structure 44. - The
notch 94 can be V-shaped. However, other shapes and configurations are contemplated as within the scope of this disclosure. In this exemplary embodiment, thenotch 94 is positioned such that it extends aft from a trailingedge 96 of theairfoil 46. In addition, apoint 98 of thenotch 94 can be positioned aft of theseal ring 82. The actual position, depth and dimensions of thenotch 94 may vary and are dependent on design and environmental specific parameters. - In one exemplary embodiment, the
notch 94 is formed at the trailingedge 86 of theseal body 85 such that a first thickness T1 extends radially outward of thenotch 94 and a second thickness T2 extends radially inwardly from thenotch 94. The first thickness T1 can be different from the second thickness T2. Thenotch 94 removes weight from theseal land 70 and can alleviate thermal mismatch that may occur between theseal land 70 and the hot combustion gases that are communicated along the core flow path C through thestatic structure 44. -
FIGS. 6A and 6B illustrate portions of another examplestatic structure 144. Thestatic structure 144 can include aseal land 170 that is similar to theseal land 70 detailed above. However, theseal land 170 can include additional features. For example, theseal land 170 can include one or more relief slots 100 (i.e., cut-out portions of the seal land 170). Although only asingle relief slot 100 is illustrated inFIGS. 6A and 6B , it should be understood that theseal land 170 of thestatic structure 144 could include a multitude ofrelief slots 100 circumferentially disposed in a spaced relationship about theseal land 170. - In one exemplary embodiment, the
relief slots 100 extend from a trailingedge 186 of theseal land 170 in the same direction as thenotch 94. Therelief slots 100 can be generally crescent shaped. Therelief slots 100 can also extend to the same depth as thenotch 94. In this exemplary embodiment, therelief slots 100 are formed on a radiallyinner surface 190 of theseal land 170. - In one example, at least one
relief slot 100 is associated with each of theairfoils 46 of thestatic structure 144. In other words, if thestatic structure 144 were to include (14)airfoils 46, then theseal land 170 could include (14)relief slots 100. Therelief slots 100 may reduce the strain experienced at portions of theairfoils 46, such as the leading or trailing edge portions. - Although the different non-limiting embodiments are illustrated as having specific components, the embodiments of this disclosure are not limited to those particular combinations. It is possible to use some of the components or features from any of the non-limiting embodiments in combination with features or components from any of the other non-limiting embodiments.
- It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should also be understood that although a particular component arrangement is disclosed and illustrated in these exemplary embodiments, other arrangements could also benefit from the teachings of this disclosure.
- The foregoing description shall be interpreted as illustrative and not in any limiting sense. A worker of ordinary skill in the art would recognize that various modifications could come within the scope of this disclosure. For these reasons, the following claims should be studied to determine the true scope and content of this disclosure.
Claims (20)
Priority Applications (3)
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US13/487,742 US9394915B2 (en) | 2012-06-04 | 2012-06-04 | Seal land for static structure of a gas turbine engine |
PCT/US2013/042963 WO2013184454A1 (en) | 2012-06-04 | 2013-05-29 | Seal land for static structure of a gas turbine engine |
EP13801167.1A EP2855889B1 (en) | 2012-06-04 | 2013-05-29 | Seal land for static structure of a gas turbine engine |
Applications Claiming Priority (1)
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US13/487,742 US9394915B2 (en) | 2012-06-04 | 2012-06-04 | Seal land for static structure of a gas turbine engine |
Publications (2)
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US20130323046A1 true US20130323046A1 (en) | 2013-12-05 |
US9394915B2 US9394915B2 (en) | 2016-07-19 |
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US13/487,742 Active 2033-09-07 US9394915B2 (en) | 2012-06-04 | 2012-06-04 | Seal land for static structure of a gas turbine engine |
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US (1) | US9394915B2 (en) |
EP (1) | EP2855889B1 (en) |
WO (1) | WO2013184454A1 (en) |
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Also Published As
Publication number | Publication date |
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EP2855889A1 (en) | 2015-04-08 |
WO2013184454A1 (en) | 2013-12-12 |
EP2855889A4 (en) | 2016-01-13 |
US9394915B2 (en) | 2016-07-19 |
EP2855889B1 (en) | 2018-03-14 |
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